太阳光球中铕的丰度。CO5BOLD三维流体动力学模式大气的结果
The solar photospheric abundance of europium. Results from CO5BOLD 3-D hydrodynamical model atmospheres
摘要：
上下文铕是一种几乎纯的r过程元素，在核宇宙年代学中可能有参考价值。目标。利用CO 5 BOLD三维流体动力学模式大气确定光球太阳丰度。方法.圆盘中心和积分通量观测太阳光谱。铕的丰度是从等效宽度测量得出的。此外，还使用了1D模型大气作为参考。结果铕的光球太阳丰度为0.52 ± 0.02，与以前的测定结果一致。根据强度谱和通量谱，我们还确定了Eu（151）的光球同位素分数分别为49% ± 2.3%和50% ± 2.3。这与陨石同位素分数47.8%相比很好。我们还探讨了在~5000 K至~6500 K温度范围内的矮星和亚巨星以及太阳和1/10-太阳金属丰度的3D修正，发现它们对于所有研究的模型都可以忽略不计。结论.我们的光球铕丰度是在良好的协议与以前的确定基于一维模型。这与我们的结论一致，即在太阳的情况下，该元素的3D效应可以忽略不计。
英文摘要：
Context. Europium is an almost pure r-process element, which may be useful as a reference in nucleocosmochronology. Aims. To determine the photospheric solar abundance using CO5BOLD 3-D hydrodynamical model atmospheres. Methods. Disc-centre and integrated-flux observed solar spectra are used. The europium abundance is derived from the equivalent width measurements. As a reference 1D model atmospheres have been used, in addition. Results. The europium photospheric solar abundance is 0.52 +- 0.02 in agreement with previous determinations. We also determine the photospheric isotopic fraction of Eu(151) to be 49 % +- 2.3 % from the intensity spectra and 50% +-2.3 from the flux spectra. This compares well to the the meteoritic isotopic fraction 47.8%. We explore the 3D corrections also for dwarfs and sub-giants in the temperature range ~5000 K to ~6500 K and solar and 1/10--solar metallicities and find them to be negligible for all the models investigated. Conclusions. Our photospheric Eu abundance is in good agreement with previous determinations based on 1D models. This is in line with our conclusion that 3D effects for this element are negligible in the case of the Sun.
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